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#76283 04/13/2007 5:26 AM | Joined: Jul 2000 Posts: 962 Shop Shark | | Shop Shark Joined: Jul 2000 Posts: 962 | I've got a Howard M4F cam w/solid lifters in a 235. What is the int/exh hot valve lash supposed to be? Can't find the cam card.
Also, engine has a random miss during cruise. Goes away during accel, comes back during cruise. Engine is in tune, Holley 390 on Clifford, 56 jets in primary. Fentons. R45 plugs gapped .045" w/pertronix.
Thanks, chip
Preaching the Hot Rod Gospel according to the 4-stroke apostles:
Suck, Squish, Fire and Fumes
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#76284 04/13/2007 5:51 AM | Joined: Mar 2005 Posts: 1,029 Member | | Member Joined: Mar 2005 Posts: 1,029 | Sometimes too much initial advance can cause surging at cruise. | | |
#76285 04/13/2007 11:24 AM | Joined: Dec 2003 Posts: 2,733 Shop Shark | | Shop Shark Joined: Dec 2003 Posts: 2,733 | I-.016
E-.016 per the card with my cam. | | |
#76286 04/14/2007 4:46 AM | Joined: Jul 2000 Posts: 962 Shop Shark | | Shop Shark Joined: Jul 2000 Posts: 962 | I've got about 15* BTDC, 35* at 3000 RPM. Starts as soon as I bump the key. Too much timing? Maybe I've got too much vacuum advance. Any way to limit travel on the 235 vacuum can?
So clearance is .016" for both intake and exhaust? Seems like I remember larger clearances on the card.... maybe for break-in?
thanks, chip
Preaching the Hot Rod Gospel according to the 4-stroke apostles:
Suck, Squish, Fire and Fumes
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#76287 04/14/2007 1:48 PM | Joined: Feb 2001 Posts: 1,094 'Bolter | | 'Bolter Joined: Feb 2001 Posts: 1,094 | card says 14 intake 16 exhaust
Tommy
59 apache 1/2t
261 short stepside
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#76288 04/14/2007 6:49 PM | Joined: Mar 2005 Posts: 1,029 Member | | Member Joined: Mar 2005 Posts: 1,029 | I don't know how to limit the vacuum advance, but you could disconnect it and plug the line to see if the engine smooths out at cruise as a diagnostic measure. | | |
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